package com.gong.yuanma.lock;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

/**
 * @author GongChang
 * @version 1.0
 * @date 2021/6/8 0008 18:14
 */
public class SpinLockDemo {

    //原子引用线程
    AtomicReference<Thread> atomicReference = new AtomicReference<>();

    public void myLock(){
        Thread thread = Thread.currentThread();
        System.out.println(Thread.currentThread().getName()+"\t com in");

        while (!atomicReference.compareAndSet(null,thread)){

        }

    }

    public void myUnlock(){
        Thread thread = Thread.currentThread();
        atomicReference.compareAndSet(thread,null);
        System.out.println(Thread.currentThread().getName()+"\t invoked myUnLock()");
    }

    public static void main(String[] args) {
        SpinLockDemo spinLockDemo = new SpinLockDemo();
        new Thread(()->{
            spinLockDemo.myLock();
            try {
                TimeUnit.SECONDS.sleep(5);
                spinLockDemo.myUnlock();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        },"aa").start();

        try {
            TimeUnit.SECONDS.sleep(1);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        new Thread(()->{
            spinLockDemo.myLock();
            spinLockDemo.myUnlock();
        },"bb").start();
    }
}
